Model Analysis of Axially Symmetric Linear Rotating Structures
M. Varun Kumar1, B. Ashiwini Kumar2
1M. Varun Kumar, Department of Mechanical Engineering, KL University, Vijayawada, India.
2B. Ashwini Kumar, Department of Mechanical Engineering, Assistant Professor, KL University, Vijayawada, India.
Manuscript received on March 12, 2013. | Revised Manuscript received on April 14, 2013. | Manuscript published on April 30, 2013. | PP: 843-851 | Volume-2, Issue-4, April 2013. | Retrieval Number: D1606042413/2013©BEIESP

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Abstract: Rotor dynamics is the study of vibrational behavior in axially symmetric linear rotating structures. Devices such as engines, motors, disk drives and turbines all develop characteristic inertia effects that can be analyzed to improve the design and decrease the possibility of failure. At higher rotational speeds, the inertia effects of the rotating parts must be consistently represented in order to accurately predict the rotor behavior and to decrease possibility of failure. In this mini project we are going to design a rotor model using finite element analysis (FEA) in ANSYS as per standard dimensions. After modeling in ANSYS we are going to perform the modal analysis in ANSYS using commands by using sub structuring and super element generation. If the frequency of any harmonic component of a periodic phenomenon is equal to (or) approximates the natural frequency of any mode of rotor vibration, a condition of resonance may exist. If resonance exists at a finite speed, that speed is called a critical speed. An important part of the inertia effects is the gyroscopic moment introduced by the precession motion of the vibrating rotor as it spins. This gyroscopic is accounted in the modal analysis in ANSYS.
Keywords: Vibrations, Bearings, gyroscopic effect, Campbell diagram.